'Is vscode.dev open source? What is different between monaco-editor and vscode.dev

I wanna create a website similar to https://codesandbox.io, as I see (thru google chrome dev tools) it used internally monaco-editor, but also it has files structure navigation, tabs and so on, so its more similar to https://vscode.dev, I have tried found source code of this site, but I cannot, does it private? Does codesandbox write its own separate code for managing tabs and file structure?

P.S. I talking mostly about frontend related part of it, not the backend.



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